CN100362735C - Power supply circuit with PFC inductance and TV set comprising said power supply circuit - Google Patents
Power supply circuit with PFC inductance and TV set comprising said power supply circuit Download PDFInfo
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- CN100362735C CN100362735C CNB200510044461XA CN200510044461A CN100362735C CN 100362735 C CN100362735 C CN 100362735C CN B200510044461X A CNB200510044461X A CN B200510044461XA CN 200510044461 A CN200510044461 A CN 200510044461A CN 100362735 C CN100362735 C CN 100362735C
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Abstract
The present invention discloses a power source circuit with PFCS inductance and a TV comprising the power supply circuit. A secondary stage is additionally provided with a secondary winding, and the functions of the secondary stage are expanded by losing the traditional mode of the PFCS inductance only as the use of inductance. A power source terminal of a last-stage power source chip is directly driven by matching with a corresponding control circuit, the starting of the power source chip is controlled, and the automatic cutoff of the power supply chip is controlled by the arrangement of an over-current protecting terminal, so a plurality of power sources simultaneously work in one system, one power source is used as a master control power source for effectively controlling other power sources so that the use of a relay is avoided, the noise of starting is eliminated, production cost is reduced, and product reliability is effectively improved. The present invention has the advantages of extensive application field and high practical value.
Description
Technical field
The present invention relates to a kind of improvement of power circuit, specifically, relate to a kind of improvement the power circuit that has source power factor correcting PFC inductance.
Background technology
In existing power circuit system, multiple power supplies and when depositing certainly exists the problem that the master control power supply need be controlled other power supplys, and common way is to increase relay to come the cutoff high input, thereby the pressure that realizes other power supplys stops.Adopt sort circuit structure one to come the cost height, two come startup moment of relay to have sound occurs, moreover, there is relay to come other circuit are controlled if increased in the stand-by circuit, so just there is the situation that has two relays in the power-supply system, not only increase the noise when starting, and reduced the reliability of system, be unfavorable for the extensive popularization and the application of product.Therefore, how under the situation of not using relay, allow the master control power supply that other power supplys are control effectively, make a plurality of power-supply systems according to the sequential working of prior imagination with stop just to have become the previous subject matter that needs to be resolved hurrily of order.
Summary of the invention
When the present invention realizes that in order to solve the available technology adopting relay master control power supply is controlled other power supplys, the startup noise that exists and the problem of system reliability difference, a kind of novel power circuit that has active PFC inductance is provided, pass through simple circuit configuration, under the situation of not using relay, realized of the effective control of master control power supply to other power supplys, not only eliminate the startup noise, and reduced production cost, improved reliability of products.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of power circuit of the PFC of having inductance and the television set that includes described power circuit, comprise the PFC inductance, one end of described PFC inductance connects AC power through rectifier bridge, the other end connects late-class circuit, with the elementary winding of described PFC inductance coil as transformer, level is set up secondary winding, the first end ground connection of described secondary winding secondarily, second end connects the power supply side of back level power supply chip on the one hand, connects the base stage of a positive-negative-positive triode on the other hand; The emitter of described positive-negative-positive triode connects the power supply side of described back level power supply chip, and collector electrode connects the overcurrent protection end of back level power supply chip.
As further qualification to technique scheme, second end of described secondary winding connects the positive pole of a diode, the negative pole of described diode is the power supply side of level power supply chip after a resistance connects on the one hand, links to each other through the base stage of first resistance pressure-dividing network with described positive-negative-positive triode on the other hand.In described resistance pressure-dividing network, two divider resistance series connection back one ends connect the negative pole of described diode, other end ground connection, and the tie point of two divider resistances links to each other with the base stage of described positive-negative-positive triode; Wherein, the resistance of the divider resistance of ground connection one end is greater than the resistance of another divider resistance.
As the further qualification again to technique scheme, the negative pole of described diode is also through a filter capacitor ground connection.
As further limiting again to technique scheme, first end at described secondary winding is connected with a sample circuit, in described sample circuit, include an inductance coil as described transformer secondary output winding, one end ground connection of described inductance coil, the other end directly links to each other with first end of described secondary winding on the one hand, is connected first end of described secondary winding on the other hand with second resistance and/or the 3rd resistance through the electric capacity of series connection.
Compared with prior art; advantage of the present invention and good effect are: the present invention comes out of the PFC inductance from traditional pattern of only using as inductance; level is set up secondary winding secondarily; expand its function; cooperate correspondent control circuits directly to drive the feeder ear of back level power supply chip; control its startup; and by its overcurrent protection end is set; the automatic cut-off of control power supply chip; thereby when having realized that multiple power supplies is worked simultaneously in a system; one road power supply is as the effective control of master control power supply to other power supplys; not only avoid the use of relay, eliminated the startup noise, and reduced production cost; effectively improve reliability of products, had wide application and higher utility.
Description of drawings
Fig. 1 is the concrete circuit connection diagram that has the power circuit of PFC inductance among the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Among Fig. 1, TI is a PFC accumulation of energy inductance, and an end connects AC power through rectifier bridge, and the other end connects late-class circuit, does not have secondary winding usually.Even in some has the circuit of PFC inductance, increased secondary winding, also mainly be in order to take a sample, the sample circuit formed of the T-1 winding among Fig. 1 and second resistance R 1, the 3rd resistance R 2 and capacitor C 1 for example.For the function that realizes that the present invention will finish, at the secondary secondary winding T-2 that set up of PFC inductance T1.The end of described secondary winding T-2 directly connects the T-1 winding on the one hand, and second resistance R 1, the 3rd resistance R 2 through series connection is connected the T-1 winding with capacitor C 1 on the other hand; The power supply side Vcc of the other end of described secondary winding T-2 level power supply chip after diode D1, first resistance R 3, diode D2 connect, and through diode D1, filter capacitor C2 ground connection.When power circuit is started working, there is electric current to flow through among the PFC inductance T1, at this moment, generate induced voltage among the secondary winding T-2, concrete size can be set according to the starting resistor of the Vcc pin of the back level power supply chip that will control.After diode D1 rectification, electrochemical capacitor C2 filtering, come moment to start back level power supply chip by first resistance R 3, diode D2 by the induced voltage of secondary winding T-2 output again, and then start the purpose of another road power supply when having realized start moment.After this, this road power work is at self-excitation mode.Wherein, the concrete model of described diode D1, D2, first resistance R 3 and capacitor C 2 can be determined according to actual conditions.
When abnormal conditions occurring, when power circuit is not worked, protect fully in order to realize usually, end the back level power supply.But back level power supply just is operated in self-excitation mode after moment starts, moment start-up circuit can't end it.Therefore, in order to realize the function of ending of back level power supply chip, in described power circuit, set up the protective circuit of forming by divider resistance R4, R5, resistance R 6 and a positive-negative-positive triode V1.Wherein, the base stage of described positive-negative-positive triode V1 connects the negative pole of diode D1 on the one hand through divider resistance R4, on the other hand through divider resistance R5 ground connection; The emitter of described positive-negative-positive triode V1 connects the Vcc pin of described back level power supply chip, the overcurrent protection end OCP of collector electrode level power supply chip after resistance R 6 connects.When not working unusually appears in power circuit; to not have electric current to flow through among the PFC inductance T1 or have very little electric current to flow through; at this moment; secondary winding T-1; it is very low can not respond to voltage or magnitude of voltage among the T-2; lower output voltage is through divider resistance R4; affact the base stage of described positive-negative-positive triode V1 after the R5 dividing potential drop; because the base voltage of triode V1 is very low; be lower than the Vcc pin voltage of back level power supply chip; thereby make triode V1 saturation conduction; electric current feeds back to the overcurrent protection end OCP of described back level power supply chip through resistance R 6; realize overcurrent protection, thereby back level power supply chip is quit work, reached the purpose of ending of expection.Wherein, the concrete parameter value of divider resistance R4, R5, resistance R 6 and triode V1 will rationally be set according to actual conditions.
In power circuit of the present invention, the problem that should be noted that is: the resistance that rationally set secondary winding T-2 and divider resistance R4 and R5, the resistance of general divider resistance R5 is greater than the resistance of divider resistance R4, thereby when making operate as normal, the base voltage value of triode V1 is greater than the Vcc pin magnitude of voltage of back level power supply chip, to prevent the power circuit cisco unity malfunction.And, when ending, must make triode V1 saturation conduction, thereby described back level power supply chip is stopped fully, in case misoperation occurs.
What at present, described power circuit was successful is applied in many LCD TV products.Certainly, this circuit can be applied in the circuit of low-power consumption standby requirement too.When standby, the PFC module that has has automatic hold function, at this moment, another road large power supply is ended, thereby just can realize the requirement of low standby power loss, and more much lower on the cost, thereby new approaches are provided for the application and the development of power technology than increasing a power supply that aims at stand-by circuit work.
When the present invention adopted above-mentioned simple circuit configuration to realize that multiple power supplies is worked simultaneously in a system, one road power supply had wide application and higher utility as effective control of master control power supply to other power supplys.Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (10)
1. power circuit that has the PFC inductance, comprise PFC inductance (T1), one end of described PFC inductance (T1) connects AC power through rectifier bridge, the other end connects late-class circuit, it is characterized in that: with the elementary winding of described PFC inductance coil (T1) as transformer, level is set up secondary winding (Y-2) secondarily, the first end ground connection of described secondary winding (T-2), second end connects the power supply side (Vcc) of back level power supply chip on the one hand, connects the base stage of a positive-negative-positive triode (V1) on the other hand; The emitter of described positive-negative-positive triode (V1) connects the power supply side (Vcc) of described back level power supply chip, and collector electrode connects the overcurrent protection end (OCP) of back level power supply chip.
2. the power circuit that has the PFC inductance according to claim 1, it is characterized in that: second end of described secondary winding (T-2) connects the positive pole of a diode (D1), the negative pole of described diode (D1) is the power supply side (Vcc) of level power supply chip after first resistance (R3) connects on the one hand, links to each other through the base stage of a resistance pressure-dividing network with described positive-negative-positive triode (V1) on the other hand; In described resistance pressure-dividing network, two divider resistances (R4, R5) series connection back, one end connects the negative pole of described diode (D1), other end ground connection, and the tie point of two divider resistances (R4, R5) links to each other with the base stage of described positive-negative-positive triode (V1).
3. the power circuit that has the PFC inductance according to claim 2 is characterized in that: the negative pole of described diode (D1) is through a filter capacitor (C2) ground connection.
4. the power circuit that has the PFC inductance according to claim 2 is characterized in that: in described two divider resistances (R4, R5), the resistance of the divider resistance (R5) of ground connection one end is greater than the resistance of another divider resistance (R4).
5. the power circuit that has the PFC inductance according to claim 1 and 2, it is characterized in that: first end at described secondary winding (T-2) is connected with a sample circuit, in described sample circuit, include an inductance coil as described transformer secondary output winding (T-1), one end ground connection of described inductance coil (T-1), the other end directly links to each other with first end of described secondary winding (T-2) on the one hand, is connected first end of described secondary winding (T-2) on the other hand with second resistance (R1) and/or the 3rd resistance (R2) through the electric capacity (C1) of series connection.
6. television set, comprise a power circuit that has PFC inductance (T1), one end of described PFC inductance (T1) connects AC power through rectifier bridge, the other end connects late-class circuit, it is characterized in that: with the elementary winding of described PFC inductance coil (T1) as transformer, level is set up secondary winding (T-2) secondarily, the first end ground connection of described secondary winding (T-2), second end connects the power supply side (Vcc) of back level power supply chip on the one hand, connects the base stage of a positive-negative-positive triode (V1) on the other hand; The emitter of described positive-negative-positive triode (V1) connects the power supply side (Vcc) of described back level power supply chip, and collector electrode connects the overcurrent protection end (OCP) of back level power supply chip.
7. television set according to claim 6, it is characterized in that: second end of described secondary winding (T-2) connects the positive pole of a diode (D1), the negative pole of described diode (D1) is the power supply side (Vcc) of level power supply chip after a resistance (R3) connects on the one hand, links to each other through the base stage of a resistance pressure-dividing network with described positive-negative-positive triode (V1) on the other hand; In described resistance pressure-dividing network, two divider resistances (R4, R5) series connection back, one end connects the negative pole of described diode (D1), other end ground connection, and the tie point of two divider resistances (R4, R5) links to each other with the base stage of described positive-negative-positive triode (V1).
8. television set according to claim 7 is characterized in that: the negative pole of described diode (D1) is through a filter capacitor (C2) ground connection.
9. television set according to claim 7 is characterized in that: in described two divider resistances (R4, R5), the resistance of the divider resistance (R5) of ground connection one end is greater than the resistance of another divider resistance (R4).
10. according to claim 6 or 7 described television sets, it is characterized in that: first end at described secondary winding (T-2) is connected with a sample circuit, in described sample circuit, include an inductance coil as described transformer secondary output winding (T-1), one end ground connection of described inductance coil (T-1), the other end directly links to each other with first end of described secondary winding (T-2) on the one hand, is connected first end of described secondary winding (T-2) on the other hand with second resistance (R1) and/or the 3rd resistance (R2) through the electric capacity (C1) of series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510044461XA CN100362735C (en) | 2005-08-24 | 2005-08-24 | Power supply circuit with PFC inductance and TV set comprising said power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510044461XA CN100362735C (en) | 2005-08-24 | 2005-08-24 | Power supply circuit with PFC inductance and TV set comprising said power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1731659A CN1731659A (en) | 2006-02-08 |
| CN100362735C true CN100362735C (en) | 2008-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200510044461XA Active CN100362735C (en) | 2005-08-24 | 2005-08-24 | Power supply circuit with PFC inductance and TV set comprising said power supply circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259992B (en) * | 2013-04-01 | 2016-02-10 | 青岛海信电器股份有限公司 | Standby power circuit and idle method |
| CN105323512B (en) * | 2015-11-23 | 2018-09-18 | 深圳创维－Rgb电子有限公司 | A kind of secondary control device of PFC power supplies |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001057781A (en) * | 1999-07-12 | 2001-02-27 | Internatl Rectifier Corp | Power factor control circuit and method |
| CN2595110Y (en) * | 2003-01-24 | 2003-12-24 | 于晓平 | Factor corrector for color TV-set switch power supply |
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2005
- 2005-08-24 CN CNB200510044461XA patent/CN100362735C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001057781A (en) * | 1999-07-12 | 2001-02-27 | Internatl Rectifier Corp | Power factor control circuit and method |
| CN2595110Y (en) * | 2003-01-24 | 2003-12-24 | 于晓平 | Factor corrector for color TV-set switch power supply |
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| CN1731659A (en) | 2006-02-08 |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: HISENSE Co.,Ltd. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE Co.,Ltd. Patentee before: HISENSE ELECTRIC Co.,Ltd. |